Packing for printing-presses.



F. E. ELLIS.

PACKING FOR PRINTING PRESSES.

APPLICATION FILED MAR. 22. l9l7- Patented June 26, 1917.

In van tor. .l'Tfl/zlc IL'. 561A? FBANK 'E. ELLIS, 0F REVERE,MASSACHUSETTS.

PACKING FOR PRINTING-PRESSES. 4

Specification of Letters Patent.

Patented June 26, 1917.

Application filed March 22, 1917. Serial No. 156,584.

To all whom it may concern:

Be it known that I, FRANK E. ELLIS, a citizen of the United States,residing at Revere, in the county of Suffolk and State of Massachusetts,have invented new and useful Improvements in Packing for Printing-Presses, of which the following is a specification.

The present invention relates to means for packing the impression bedsof printing presses and is particularly designed for news paper andother presses of the type in which the impression member is a rotarycylinder.

It is and long has been the usual practice to make such cylinders ofmetal, ordinarily cast metal, and to provide such cylinders ,rwithcoverings, known as blankets, which are somewhat yielding so as topermit the paper, which is pressed against the same when receiving theprinting impression, to yield and accommodate itself to theirregularities in the printing plates, while being also firm enough tohold the 'paper up against the types of the printing plates and preventthe paper from being broken or deeply indented thereby. The blanketsheretofore generally employed are the so-called' rubber blanket and feltblanket, the rubber blanket being placed directly against the cylinderand the felt blanket being laid over the rubber blanket. These blanketsgive the necessary qualities of resilience and firmness required in theimpression member of a rota press, the rubber blanket being elastic an dresilient, while the felt blanket has the required balance betweenfirmness and softness which is required of that part of the packingwhich comes directly into contact with the paper. 7

My present invention is concerned with an improvement in the packingmeans for such cylinders which combines all of the advantages of thepacking previously used, with other improvements and advantages which Iwill point out in the following specification.

In the drawings forming a part of this specification,--

Figure 1 is a cross sectional vieii of an impression cylinder having myimproved packing applied thereto. Fig. 2 is a fragmentary sectional viewon an enlarged scale of the packing.

back To such surface,

The same reference characters indicate the same parts in all of thefigures.

In the drawings,a represents a rubber blanket so-called and 6 representsfelt blanket so-called. Such rubber-blankets are composed of severallayers of frictioned textile fabric, ordinarily cotton laid together andvulcanized, with a layer or film of rubber composition havingappreciable thickness on one face thereof. The opposite face of suchpacking usually has little or no exposed rubber, or atmost only so muchas is carried by the surface of ordlnary frictioned fabric. In Fig. 2the textile fabric layers of the blankets are indicated diagrammaticallyby the undulating lines a and the dots (Z. So much of the rubber blanketas is above thereof. Another part of the blanket consists'of a facelayer or ply e which is preferably of Woven fabric, ordinarily cotton,and carries a surface coating or film f. Such coating or film ispreferably nitro cellulose which is combined with an emollient such as anon-drying oil, preferably castor oil, in order to keep the layerpliable and prevent it from becoming hard and brittle. Said face layeris united or doubled to the back of the body a by a film g of adhesivematerial, preferably a flexible oil-proof and water-proof cement. Inthis description the of the rubber blanket is that face which does notcarry a film of rubber but is of textile fabric with little or noexposed rubber. the fabric face ply e may be united or doubledsufficiently firmly for the purposes of a printers blanket by means ofany cement ofthe sort indicated.

The so-called felt blanket consists of a body, which is the partdesignated by the letter 6, and is composed of one or more plies wovenfrom woolen yarns by well known methods of weaving so as to form acompact body, the fibers of which are drawn out on one surface to form along nap which is matted down into smooth surface similar to that offelt. In the printing art, this particular fabric is called felt inspite of the fact that it is actually a woven fabric.

On the felted face of the body I) is secured or doubled by means of anadhesive layer or film [1,,3. face layer 7: having an exterior coatlngZ. The face layer is, its coating 1 and the described constitutes thebody or base V blanket.

outside of the rubber adhesive It may be and preferably are identical inconstruction and material with the face ply e, coating f and adhesivefilm 9' already described.

The coating Z is smooth, whereby it is fit to come in contact with thepaper and support it against the pressure of the printing plates. It isnon-porous and impervious, wherefore it does not absorb ink and will notpermit the oil contained in the printers ink topenetrate into the bodyof the felt It further repellent to printers ink; that is ink not adherereadily herent thereto than it is to paper. Wherefore ink deposited on asheet of paperupon one impression, and being brought immediatelythereafter into contact with the blanket of a second impression cylinderwhen receiving an impression on its other side will not deposit ink onthe face of the blanket. Thus offsetting, that is transferal of ink fromone paper or sheet by means of the blanket to a subsequent sheet passingthrough the press, is prevented. 1

The packing above described is. secured to the cylinder in any desiredway, the usual manner being preferred and that being the means hereinillustrated. First the rubber blanket is applied to the cylinder withthe face m opposite to the coated fabric ply against the surface of thecylinder. One edge of this blanket is bent into a groove extendinglongitudinally in the face of the cylinder and is put over pointed pinsa which are set into one of the walls of said groove and projecttherefrom. The other end of the blanket is carried around the cylinderand across the opposite edge of this roove, terminating just inside ofsuch edge. then similarly applied blanket, with its face layer or plyout, being engaged at one edge with the pins n and its opposite edgebeing connected to a flap or band 0 fastened to a roll 9, which ismounted rotatably in'the groove with its axis parallel to the axis ofthe cylinder. This roll is turned so as to draw the blankets tight andis secured in the ordinary way. As my invention does not involve any newmethod of securing a blanket upon a cylinder, but involves only The feltblanket is the old and commonly used means for this purpose, I have notdeemed it necessary to illustrate such means in complete detail.

- It will be appreciated that the packingherein described, as itembodies a rubber blanket on and a felt blanket I) having thecharacteristics of the so-called rubber and felt'blankets' heretoforeused, possesses .all of the useful features'of the blankets heretoforeused. It also possesses new and valuable advantages by reason of theface. layers e and k with their coatings and with the films of adhesivewhich unite them to the rubber and has the quality of being I does to itand is much less ad-' ket. In the case of the rubber blanket, suchaction consists in dissolving and destroying the rubber, making it softand spongy and causing it to lose its resilience. In the case of thefelt blanket, it soaks through and spoils the same, making it soggy anddea and thus shortening its ultimate period of usefulness. The oil-proofadhesive which attaches these face plies to the blanket bodies also hasthe effect of excluding oil in case the impervious surface coatingshould be cracked or broken 0E. The felt blanket body is thus protectedby-two layers of oil-proof material, and the rubber blanket body by fourlayers of such material.

, Either blanket, by reason of its smooth nonofisetting surface, 18adapted to be placed on the outside and to be run in contact with thepaper on the impression cylinder of the second impression. In case theface ply of either blanket becomes injured by the cracking or breakageof its surface coating or otherwise so as to be no longer useful, suchlayer may be readily stripped from the body or base layer and anothersimilar layer laid over it and secured to the cylinder in the mannerdescribed. Since .the face layer 6 is united to the fabric face of therubber blanket by an adhesive, that is, otherwise than by vulcanization,it may be readily removed and another facelayer substituted; a resultwhich is not possible in case of a layer which is united to a rubbervulcanization.

What I claim and desire to secure by Letters Patent is:

1. The combination with the impression member of a printing press, of arubber blanket having a face layer doubled thereto secured to thecylinder next to the surface thereof, and a felt blanket secured to thecylinder so said rubber blanket, said felt blanket having a face layervdoubled thereto and provided on its outer side with a non-ofisettingcoating.

2'. A packing for the impression member of a printing press, comprisinga rubber blanket and a felt blanket, each kets having a face layer offabric secured to the body portion of said blankets by an adhesive whichis oil-proof and water-proof, and said face layers each having an outercoating of material which is repellent to ink and is non-absorbentandsmooth. 3. Apacking for of a printing press, comprising arubber blanketbody including textile fabric disp'osed on .onesurface thereof and aface article of as-to overlie the face layer of of said blantheimpression member layer of fabric doubled with oil-proof adsaid blanketsbeing arranged outside of the hesive to the fabric side of Said ru berblanother blanket with its ink-repellent coating ket body and having anouter coating of outward.

nitro cellulose, and a felt blanket body hav- 5. A printers blanket,comprising a rub- 5 ing a face layer doubled thereto, said face her andfabric body having a fabric sheet layer being provided-With an outercoating disposed on one face thereo and being vulof nitro cellulose.canized, a fabric face layer vunited by an 4. A packing for theimpression cylinder adhesive to the fabric side of said rubber of aprinting press, comprising a rubber blanket, and a coating of nitrocellulose on 10 blanket body and a felt blanket body, each the outerside of said face layer and hav of said blanket bodies having a facelayer ing 'a smooth impervious surface which is united thereto by anadhesive, and each of repellent to printers ink.

said face layers having a coating of ma- In testimony whereof I haveafixed my terial Which is impervious to oil and is re-' signature.

is pellent to printers ink and smooth, one of I FRANK E. ELLIS.

